Kristin Cavallari, 37, packs on PDA with new boyfriend Mark Estes, 24, as she makes her 'country' debut on his popular Montana Boyz TikTok... after a bikini-filled romp with the model

Kristin Cavallari's romance with her new boyfriend Mark Estes is heating up.

The former Laguna Beach star, 37, popped up in a fun video on the 24-year-old model's joint TikTok, the Montana Boyz, alongside his buddies on Friday, just three days after she revealed their relationship.

In the short clip, the Montana Boyz  - Estes, Kaleb Campbell Winterburn and Kade Wilcox - lip-sync to Jason Aldean's 2009 hit She's Country as they appear to introduce Kristin as part of their posse. 

Decked out in jeans and a T-shirt reading 'This Ain't My First Coors Rodeo,' Kristin flashes her megawatt smile before Mark hugs her from behind. 

Gaining over 1 million views in less than 6 hours after being posted, the endearing video was captioned: 'Brother, she's country.' 

Kristin's debut on the Montana Boyz page comes after she shared a bikini-filled romp with Mark on his personal TikTok. 

Rocking a green two-piece, Kristin jumped into the muscular arms of her new beau as they frolicked by the side of a pool. 

The adorable couple packed on the PDA while the country song (Kissed You) Goodnight by Gloriana played in the background. 

The new couple alert comes nearly four years after her split from former NFL player Jay Cutler, who is the father of her three children. 

Kristin revealed her latest love match on Tuesday, when she shared a photo of herself cozying up to Mark during their getaway in Los Cabos, Mexico.

She captioned the surprising snap, 'He makes me happy.' 

Originally from Montana, Mark played wide receiver for Montana State University's football team. 

Now residing in Nashville, he shares the same city with Kristin.

As reported by TMZ, the pair has been spending time together for approximately a month, but their connection hasn't reached a serious stage. 

Insiders revealed to the outlet that Kristin and Mark jetted off to Mexico together last week, with eyewitnesses noting they were openly displaying affection during the flight. 

Kristin and Jay announced that they were getting divorced in April of 2020 after seven years of marriage.

The former couple share three children: Camden, 11, Jaxon, nine, and Saylor, eight.

Kristin's new romance comes after she admitted she wasn't in a dating state of mind last year. 

'It's really not important to me right now,' she told E! News in September 2023. 'It's just not with where I'm at in my life,' she added.

'I'm mom, first and foremost,' she continued. 

'And I've had a lot of fun in the last few years, just really focusing on my friends and getting to hang out with my friends again, because I didn't get to do that for a long time.'

Kristin gained prominence in 2004 with her role as a high school junior on MTV's Laguna Beach: The Real Orange County. 

Following this, she featured in projects like CSI: NY, Spring Breakdown, and The League.

From 2018 to 2020, Kristin showcased her Uncommon James line in her own reality show Very Cavallari.